Gas Transfer Pumps A gas transfer pump is a vacuum pump that allows gas to be drawn in and out continuously to achieve the purpose of pumping. There are basically two types of pumps: Bajaj/Tvs Series Ingtion Switch Bajaj/Tvs Series Ingtion Switch,Mtorcycle Igniton Swtich With Computer Key,Tvs Mtorcycle Igniton Swtich Brass Key,Mtorcycle Igniton Swtich Brass Light Key Zhejiang Lisheng Motorcycle Parts Co.,Ltd , https://www.lishengmotorparts.com
Variable capacity vacuum pump A vacuum pump that uses the periodic variation of the volume of the pump chamber to complete the intake and exhaust processes. The gas is compressed before it is discharged. This pump is divided into two kinds of reciprocating and rotary type:
(1) Reciprocating vacuum pump: The reciprocating motion of the piston in the pump chamber is used to suck in, compress and discharge the gas. Therefore, it is also called a piston vacuum pump.
(2) Rotary vane vacuum pump: It uses the piston inside the pump chamber to do rotary motion to suck in gas, compress it and discharge it. The rotary vacuum pump has the following forms:
1 Oil-sealed vacuum pump: It is a rotary variable-capacity vacuum pump that uses oil to seal the gap between moving parts and reduce harmful space. This type of pump usually has a gas ballast, so it is also called a gas ballast pump. According to its structural characteristics are divided into the following five forms.
a rotary vane vacuum pump: the rotor is installed in the pump casing with a certain eccentricity and is close to the fixing surface of the inner surface of the pump casing. Two (or more than two) rotary vanes are installed in the rotor slot, and the rotary vane rotates when the rotor rotates. It is able to reciprocate along its radial groove and is always in contact with the inner wall of the pump casing. This rotor rotates with the rotor and divides the pump chamber into several variable volumes.
b.Spool type vacuum pump: A slide valve is installed outside the eccentric rotor. The rotation of the rotor drives the slide valve to slide and roll along the inner wall of the pump housing. The slide valve rod on the upper part of the slide valve can slide in the swingable slide valve guide, and the pump The cavity is divided into two variable volumes.
c. Fixed-plate vacuum pump: an eccentric rotor close to the inner surface of the pump is installed in the pump casing. The pump casing is equipped with a radial vane which is always in contact with the rotor surface. When the rotor rotates, the vane can slide up and down to pump The cavity is divided into two variable volumes.
d. Trochoidal vacuum pump: In the pump chamber eccentrically equipped with a trochoidal model rotor, it rotates along the inner wall of the pump chamber and divides the pump chamber into two variable volumes.
e. Multi-chamber rotary vane vacuum pump: A rotary vane vacuum pump with multiple independent working chambers driven by the same motor is installed in parallel in a pump casing.
2 Dry screw vacuum pump: It is a variable capacity vacuum pump that is not sealed with oil (or liquid).
3 Liquid ring vacuum pump: The rotor with multiple blades is eccentrically mounted in the pump casing. When it rotates, the liquid (usually water or oil) is thrown into the pump casing to form the concentric ring of the pump casing. The blades form several small volumes with periodic changes in volume, and are also known as rotary variable capacity vacuum pumps.
4 Roots vacuum pump: The pump is equipped with two rotors with double lobe or multi-lobal synchronous rotation in the opposite direction, and the rotor, rotor and the inner wall of the pump casing maintain a certain gap. It belongs to a rotary variable capacity vacuum pump. The mechanical booster pump is this type of vacuum pump.
Momentum transfer pumps: These pumps rely on high-speed rotating blades or high-speed jets to transfer momentum to gas or gas molecules, allowing gas to continuously transfer from the pump's inlet to the outlet. Specific can be divided into the following types.
(1) Molecular vacuum pump: It is a kind of vacuum pump that uses high-speed rotating rotor to transfer energy to gas molecules to make it compressed and exhausted. It has the following types:
1 Traction molecular pump: Gas molecules collide with a high-speed rotor to gain power and are sent to the exit. Therefore, it is a momentum transfer pump.
2 turbo-molecular pump: The pump is equipped with a slotted disk or bladed rotor that rotates between stator discs (or stators). The line speed of the rotor circumference is high. This kind of pump usually works in the molecular flow state.
3 Compound molecular pump: It is a compound molecular vacuum pump that is connected in series by turbo-type and traction type molecular pumps.
(2) Jet vacuum pump: It is a kind of momentum transfer pump that uses the high-pressure jet produced by the pressure drop of the VENTURI effect to deliver gas to the outlet, and is suitable for working in the state of sticking and transient flow. This pump can be further divided into the following categories:
1 Liquid jet vacuum pump: Jet vacuum pump with liquid (usually water) as the working medium.
2 Gas jet vacuum pump: Jet vacuum pump with non-condensable gas as working medium.
3 Steam jet vacuum pump: Hungry jet vacuum pump using steam (water, oil or mercury vapor) as working medium
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